import java.util.Scanner;
  
   public class MyDCTester  {
  
     public static void main (String[] args) {
  
       String expression, again;
  
      int result;
 
      try
      {
        Scanner in = new Scanner(System.in);
 
        do
        {
          MyDC evaluator = new MyDC();
          System.out.println ("Enter a valid postfix expression: ");
          expression = in.nextLine();
 
          result = evaluator.evaluate (expression);
          System.out.println();
          System.out.println ("That expression equals " + result);
 
          System.out.print ("Evaluate another expression [Y/N]? ");
          again = in.nextLine();
          System.out.println();
       }
       while (again.equalsIgnoreCase("y"));
     }
      catch (Exception IOException)
      {
        System.out.println("Input exception reported");
      }
    }
  }

